[GitHub] [flink] TsReaper commented on a change in pull request #12069: [FLINK-14807][streaming] Add specialized collecting sink function

[GitBox <gi...@apache.org>]

TsReaper commented on a change in pull request #12069:
URL: https://github.com/apache/flink/pull/12069#discussion_r424860738



##########
File path: flink-streaming-java/src/main/java/org/apache/flink/streaming/api/operators/collect/CollectSinkOperatorCoordinator.java
##########
@@ -0,0 +1,212 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.streaming.api.operators.collect;
+
+import org.apache.flink.core.memory.DataInputViewStreamWrapper;
+import org.apache.flink.core.memory.DataOutputViewStreamWrapper;
+import org.apache.flink.runtime.jobgraph.OperatorID;
+import org.apache.flink.runtime.operators.coordination.CoordinationRequest;
+import org.apache.flink.runtime.operators.coordination.CoordinationRequestHandler;
+import org.apache.flink.runtime.operators.coordination.CoordinationResponse;
+import org.apache.flink.runtime.operators.coordination.OperatorCoordinator;
+import org.apache.flink.runtime.operators.coordination.OperatorEvent;
+import org.apache.flink.util.Preconditions;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.net.InetSocketAddress;
+import java.net.Socket;
+import java.util.Collections;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+
+/**
+ * {@link OperatorCoordinator} for {@link CollectSinkFunction}.
+ *
+ * <p>This coordinator only forwards requests and responses from clients and sinks,
+ * it does not store any state in itself.
+ */
+public class CollectSinkOperatorCoordinator implements OperatorCoordinator, CoordinationRequestHandler {
+
+	private static final Logger LOG = LoggerFactory.getLogger(CollectSinkOperatorCoordinator.class);
+
+	private InetSocketAddress address;
+	private Socket socket;
+
+	private ExecutorService executorService;
+
+	@Override
+	public void start() throws Exception {
+		this.executorService = Executors.newFixedThreadPool(1);
+	}
+
+	@Override
+	public void close() throws Exception {
+		closeCurrentConnection();
+		this.executorService.shutdown();
+	}
+
+	@Override
+	public void handleEventFromOperator(int subtask, OperatorEvent event) throws Exception {
+		Preconditions.checkArgument(
+			event instanceof CollectSinkAddressEvent, "Operator event must be a CollectSinkAddressEvent");
+		address = ((CollectSinkAddressEvent) event).getAddress();
+		LOG.debug("Received sink socket server address: " + address);

Review comment:
       This log will be printed rather frequently, so I prefer a debug log.




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